If a high school kid can rig a drone with a Glock, then surely the Russians can put a semi-auto shotgun chassis under a small cheap FPV drone and take out as many oppo drones as you have shells loaded up. If you can get close enough to ram it, then even cheap steel goose loads would do a job on even a large drone. Otherwise load it with tungsten shotshells. Still only a few bucks a shell vs the cost of a drone and it's reloadable and reusable. Cost to benefit is 1,000:1.
While looking for an image, it appears they may already have. Perhaps the ramming story was subterfuge.
https://interestingengineering.com/innovation/russian-made-drone-shoots-down-other-drones-with-shotgun